#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

const ll N = 1e6 + 10, INF = 0x3f3f3f3f;

ll n;
ll a[N], st[N];
map<ll, ll> hs;

void solve()
{
    cin >> n;
    n = n * 2;
    for (ll i = 1;i <= n;i++) {
        cin >> a[i];
        if (hs[a[i]] == 0) { st[i] = 1; hs[a[i]] = i; }
    }
    ll ans = 0;
    for (ll i = 1;i <= n;i++)
        if (st[i] == 0) ans += i - hs[a[i]] - 1;

    ll l = 1, r = n;
    while (st[l] == 1) l++;
    while (st[r] == 0) r--;
    if (l < r) ans += 2 * (r - l);

    cout << ans << '\n';
}

signed main()
{
    // ios::sync_with_stdio(0);
    // cin.tie(0);cout.tie(0);
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    ll T = 1;
    //cin>>T;
    for (ll i = 1;i <= T;i++) {
        solve();
    }
}